Question

Existence of four chambered working heart starts from
(a) Amphibia
(b) Reptilia
(c) Aves
(d) Mammalia​

Answer 1

Answer:

option d

Explanation:

Amphibians have a three-chambered heart,

Mammals and birds have a four-chambered heart

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Excuse me if my answer is wrong,i am not a biology student to understand the terminology